Improvement in paints



J. S. DORSEY, OF NEW YORK, N. Y.

IMPROVEMENT IN PAINTS.

Specification forming part of Letters Patent No. 20,993, dated July 27, 1858.

To all whom it may concern:

Be it known that I, J. S. DORSEY, of .the city, county, and State of New York, have invented a newand useful Paint for all Kinds of Plaster-Work; and I do hereby declare that the following is a full, clear, and exact description of the component parts of and methods of compounding and using the same.

My new paint is intended to be used as a substitute for oil-paint in painting the plaster walls and ceilings of buildings and other indoor plaster-Work. Its character is such that it becomes exceedingly hard, is not affected by dampness of the plaster or of the atmosphere, will not peel oif from the plaster as oil-paint freq uentl y does, resists the action ofallchanges of atmospheric temperature, admits of the use of all mineral or metallic coloring-matters, either mixed with it or for ornamental work upon its surface, is not affected by the action of gases so much as oil-paints, and requires fewer coats than are necessary when oil-paint is used.

' To make my paint I grind one and a half (1%) pound of carbonate of lead or oxide of zinc in a half (1}) pint oflinseed or cotton-seed oil, and to these I add three-quarters (g) of a pound of pulverized and well-sifted dry carbonate of lime, and reduce this compound by means of a vehicle composed as follows: onequarter (1}) of a pound of borate of soda dis solved in one pint of water at a temperature of 212 Fahrenheit, four (4) pints of spirits of turpentine, two (2) pints of alcohol, and a halt a) ounce of sulphate of copper dissolved in a pint of Water. The borate of soda is to be dissolved in the warm water, and the solution is to have the alcohol added while it is warm, and immediately afterward the spirits of turpentine and the solution of sulphate of copper, and the whole to be Well stirred together. This compound vehicle may be kept on hand mixed.

t The vehicle before being used should be well shaken. The carbonate of lime is added to the ground carbonate of lead or oxide of zinc at the time of adding the vehicle to reduce it, and all stirred Well together. A sufficient quantity of the vehicle only is added at first to make the mixture of the consistence of a sirup, and then the mixture is allowed to stand for twenty-four (24) hours, after which it may be further reduced quired for use.

The quantity of the vehicle specified in the above formula is about sufficient to reduce the specified quantities of ground carbonate of lead or zinc. The addition of sulphate of zinc and acetate of lead for a drier will be required as with common oil-paint, the quantity requiring to be varied according to the state of the weather or temperature of the place where the paint is used, and being determined by the judgment of the painter, as in the mixing of common oil-paint.

The character of the paint may be improved that is to say, itmay be made to dry hard erby the addition of either finely-pulverized white sand or sulphate of baryta, in the proportion of one-eighth above specified quantity of paint, the sand or sulphate of baryta to be added along with the carbonate of lime. When sulphate of baryta is used the solution of sulphate of copper may be omitted from the vehicle.

Before using this paint the surface to be painted is washed over with a solution of one (1) pound of glue, one (1) pound of common soap, and half a pound of alum in five (5) quarts of water, the glue and soap to be first dissolved in four (4) quarts of the water at 212 Fahrenheit, and the alum to be dissolved in one (1) quart of Water at the same temperature, and then poured gentl Y and stirred into the solution of soap and glue.

The plaster is washed over with the above compound solution, and in six (6) hours after, if the plaster were previously dry, or in twelve (12) hours after, if the plaster were damp, the paint is laid on with a brush -in the usual manner of painting. In twelve (12) hours after the painting another coating of the soap, alum, and glue solution is applied, and in from six (6) to twelve (12) hours aftera second coating of the paint is given, which completes the work.

In a few weeks this paint becomes exceedingly hard, and, unlike oil-paint, it becomes like a portion of the wall or plaster, while it can be scrubbed with soap and water for the purpose of cleaning it without any danger of its coming off.

to the consistency re- The durability of the paint may be increased of a pound to the by varnishing it over with a eollodion varnish The paint composed of carbonate of lead made by dissolving one (1) pound of the 001- or oxide of zinc, ground in oil, mixed with lodion of commerce in two (2) quarts of sulcarbonate of lime, and reduced by the comphuric ether, and adding two (2) gallons of 211- pound vehicle herein specified, either with or cohol. This varnish gives no gloss, but hardwithout the addition of pulverized sand or ens the paint and protects it from the action" sulphate of baryta and sulphate of copper.

of the oxygen of the atmosphere and other J. STANLEY DORSEY. gases. Witnesses:

What I claim as my invention, and desire J. D. BUGKLEY, to secure by Letters Patent, is-- MICH: HUGHES. 

